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Home >> Lexus >> 2021 >> LS 500h RWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System (W/O Advanced Park) - Diagnostic Codes (1 Of 3) >> AIRBAG SYSTEM (w/o Advanced Park) >> DTC B1628: Side Airbag Sensor Assembly Initialization Error (LH) [10/2020 - 11/2021] >> Procedure

DTC B1628: Side Airbag Sensor Assembly Initialization Error (LH) [10/2020 - 11/2021]: Procedure

  1. CHECK PAST DTC 
    1. Turn the power switch on (IG), and wait for at least 60 seconds.
    2. Check for DTCs.

      Refer to DTC CHECK / CLEAR [10/2020 - 10/2023]

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Proceed to
      DTC B1627 is not output
      DTC B1627 is output

    Result: 

    DTC B1627 is output 

    GO TO DTC B1627. Refer to  DTC B1625: Side Airbag Sensor Assembly (LH); DTC B1627: Side Airbag Sensor Assembly Lost Communication (LH) [10/2020 - 11/2021]  

    Result: 

    DTC B1627 is not output 

    See step  2

  2. CHECK DTC 
    1. Turn the power switch off.
    2. Turn the power switch on (IG), and wait for at least 60 seconds.
    3. Check for DTCs.

      Refer to DTC CHECK / CLEAR [10/2020 - 10/2023]

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Proceed to
      DTC B1628 is output
      DTC B1628 is not output

      HINT: 

      Codes other than DTC B1628 may be output at this time, but they are not related to this check.

    Result: 

    DTC B1628 is not output 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021] 

    Result: 

    DTC B1628 is output 

    See step  3

  3. CHECK CONNECTION OF CONNECTORS 
    1. Turn the power switch off.
    2. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.
    3. Check that the connectors are properly connected to the rear airbag sensor LH and side airbag sensor assembly LH.

      Result

      Proceed to
      The connectors are properly connected
      The connectors are not properly connected

    Result: 

    The connectors are not properly connected 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    The connectors are properly connected 

    See step  4

  4. CHECK CONNECTORS 
    1. Disconnect the connectors from the rear airbag sensor LH and side airbag sensor assembly LH.
    2. Check that the connectors (on the rear airbag sensor LH side and side airbag sensor assembly LH side) are not damaged.
      GTY783693Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Side Airbag Sensor Assembly LH
      *2 Rear Airbag Sensor LH
      *3 Floor Wire

      Result

      Proceed to
      The connectors are not deformed or damaged
      The connectors are deformed or damaged

    Result: 

    The connectors are deformed or damaged 

    REPLACE FLOOR WIRE 

    Result: 

    The connectors are not deformed or damaged 

    See step  5

  5. CHECK FLOOR WIRE 
    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
      GTY778444Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Side Airbag Sensor Assembly LH
      *2 Rear Airbag Sensor LH
      *3 Floor Wire
      *4 Service Wire
      *a Front view of wire harness connector
      (to Side Airbag Sensor Assembly LH)
      *b Front view of wire harness connector
      (to Rear Airbag Sensor LH)
    2. Turn the power switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      L66-4 (BBL+) - Body ground Power switch on (IG) Below 1 V
      L66-3 (BBL-) - Body ground Power switch on (IG) Below 1 V
    4. Turn the power switch off.
    5. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.
    6. Using a service wire, connect terminals 1 (BBL+) and 2 (BBL-) of connector B.
      NOTE:

      Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L66-4 (BBL+) - L66-3 (BBL-) Always Below 1 Ω
    8. Disconnect the service wire from connector B.
    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L66-4 (BBL+) - L66-3 (BBL-) Always 1 MΩ or higher
      L66-4 (BBL+) - Body ground Always 1 MΩ or higher
      L66-3 (BBL-) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FLOOR WIRE 

    Result: 

    OK 

    See step  6

  6. CHECK SIDE AIRBAG SENSOR ASSEMBLY LH 
    1. Connect the connector to the rear airbag sensor LH.
      GTY810198Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Side Airbag Sensor Assembly RH
      *2 Rear Airbag Sensor LH
    2. Interchange the side airbag sensor assembly LH with RH and connect the connectors to them.
    3. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
    4. Turn the power switch on (IG), and wait for at least 60 seconds.
    5. Clear the DTCs stored.

      Refer to DTC CHECK / CLEAR [10/2020 - 10/2023]

      Body Electrical > SRS Airbag > Clear DTCs 

    6. Turn the power switch off.
    7. Turn the power switch on (IG), and wait for at least 60 seconds.
    8. Check for DTCs.

      Refer to DTC CHECK / CLEAR [10/2020 - 10/2023]

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Proceed to
      DTC B1623 is output
      DTC B1628 is output
      DTC B1623 and B1628 are not output

      HINT: 

      Codes other than DTC B1623 and B1628 may be output at this time, but they are not related to this check.

    9. Turn the power switch off.
    10. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.
    11. Return the side airbag sensor assembly RH and LH to their original positions and connect the connectors to them.

    Result: 

    DTC B1623 is output 

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH. Refer to  REMOVAL [10/2020 - 11/2021] 

    Result: 

    DTC B1623 and B1628 are not output 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021] 

    Result: 

    DTC B1628 is output 

    See step  7

  7. CHECK DTC 
    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
    2. Turn the power switch on (IG), and wait for at least 60 seconds.
    3. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [10/2020 - 10/2023]

      Body Electrical > SRS Airbag > Clear DTCs 

    4. Turn the power switch off.
    5. Turn the power switch on (IG), and wait for at least 60 seconds.
    6. Check for DTCs.

      Refer to DTC CHECK / CLEAR [10/2020 - 10/2023]

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Proceed to
      DTC B1628 is output
      DTC B1628 is not output

      HINT: 

      Codes other than DTC B1628 may be output at this time, but they are not related to this check.

    Result: 

    DTC B1628 is output 

    REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [10/2020 - 11/2021] 

    Result: 

    DTC B1628 is not output 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021] 

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